Developer Utilities
Small developer utilities that save a trip to a random website. Encode and decode Base64, explain a regex, build UTM links, generate QR codes and vCards, and more — the everyday helpers. Free in your browser, and available by API when you need them in a script.
Developer Utilities
Aircraft fuel burn calculator
flight fuel with reserve
POST /travel/aircraft-fuel-burn$0.002Developer Utilities
EV fast charge time with taper
DC charging above 80% SOC
POST /travel/ev-fast-charge-taper$0.002Developer Utilities
EV time to full charge calculator
SOC, kWh, kW with taper
POST /travel/ev-time-to-full$0.002Developer Utilities
Required Rate of Climb Calculator
Ground Speed and Gradient
POST /travel/required-climb-rate$0.002Developer Utilities
Runway wind components calculator
headwind, tailwind and crosswind
POST /travel/runway-wind-components$0.002Developer Utilities
Top of descent calculator
TOD distance from cruise altitude free
POST /travel/top-of-descent$0.002Developer Utilities
True airspeed from indicated airspeed calculator
POST /travel/true-airspeed-from-ias$0.002Developer Utilities
Aircraft weight and balance calculator
CG, total weight and moment
POST /travel/weight-and-balance$0.002Developer Utilities
Boat fuel consumption calculator
voyage fuel from speed and distance
POST /travel/boat-fuel-consumption$0.002Developer Utilities
Total flight time with layovers calculator
sum segments + connections
POST /travel/flight-with-layovers$0.002Developer Utilities
True ground track from heading calculator
TAS, wind & GS
POST /travel/ground-track-from-heading$0.002Developer Utilities
Lighthouse geographic range calculator
light + eye height
POST /travel/lighthouse-geographic-range$0.002Developer Utilities
Speed Over Ground with Current Calculator
SOG and COG
POST /travel/speed-over-ground$0.002Developer Utilities
TAS from Mach and temperature calculator
true airspeed at cruise OAT
POST /travel/tas-from-mach$0.002Developer Utilities
Tide Height Rule of Twelfths Calculator
POST /travel/tide-rule-of-twelfths$0.002Developer Utilities
Altitude sickness risk calculator
estimate AMS risk and ascent rate
POST /travel/altitude-sickness-risk$0.002Developer Utilities
Excess baggage fee calculator
estimate overweight bag charges
POST /travel/baggage-excess-fee$0.002Developer Utilities
Beaufort wind scale calculator
force number and sea state free
POST /travel/beaufort-scale$0.002Developer Utilities
Boat ETA from Speed Calculator
Nautical Miles and Knots
POST /travel/boat-eta$0.002Developer Utilities
Frequent-flyer miles earned
fare or distance × rate + status
POST /travel/miles-earned$0.002Developer Utilities
Travel per diem calculator
prorate first and last days
POST /travel/per-diem$0.002Developer Utilities
Sail Area to Displacement Ratio Calculator
POST /travel/sail-area-displacement$0.002Developer Utilities
Trip budget by days calculator
lodging, food, transport, activities
POST /travel/trip-budget-by-days$0.002Developer Utilities
Award ticket fuel surcharge calculator
points, taxes and cash cost
POST /travel/award-fuel-surcharge$0.002Developer Utilities
Currency exchange amount calculator
convert with rate, fee or markup
POST /travel/currency-exchange$0.002Developer Utilities
Drive vs fly cost comparison calculator
POST /travel/drive-vs-fly$0.002Developer Utilities
Flight price per mile calculator
cost per mile or km from fare
POST /travel/flight-price-per-mile$0.002Developer Utilities
Travel pace to speed
min/km or min/mi to km/h, mph and tour ETA
POST /travel/pace-to-speed$0.002Developer Utilities
Driver reaction distance calculator
speed and reaction time
POST /travel/reaction-distance$0.002Developer Utilities
Car total cost of ownership calculator
purchase, fuel and depreciation
POST /travel/total-cost-ownership$0.002Developer Utilities
Axle Weight Distribution Calculator
Front and Rear Loads
POST /travel/axle-weight-distribution$0.002Developer Utilities
EV kWh per 100 miles calculator
efficiency from trip energy and distance
POST /travel/ev-kwh-per-100mi$0.002Developer Utilities
Rolling resistance power calculator
force and W from weight, Crr
POST /travel/rolling-resistance-power$0.002Developer Utilities
Route time savings calculator
compare distance, speed and detours
POST /travel/route-time-savings$0.002Developer Utilities
Speedometer calibration factor calculator
tire and gear changes
POST /travel/speedo-calibration$0.002Developer Utilities
Underinflation fuel penalty calculator
MPG loss per PSI low, free
POST /travel/underinflation-fuel-penalty$0.002Developer Utilities
Engine volumetric efficiency calculator from airflow and RPM
POST /travel/volumetric-efficiency$0.002Developer Utilities
Wheel torque calculator
engine torque × gear × final drive
POST /travel/wheel-torque$0.002Developer Utilities
Best runway for wind calculator
rank crosswind and headwind
POST /travel/best-runway-for-wind$0.002Developer Utilities
EV off-peak charging savings
annual peak vs off-peak electricity cost
POST /travel/ev-off-peak-savings$0.002Developer Utilities
Initial flight bearing calculator from airport coordinates
POST /travel/initial-flight-bearing$0.002Developer Utilities
Temperature at altitude calculator
standard lapse rate
POST /travel/temperature-at-altitude$0.002Developer Utilities
Cold Temperature Altimeter Error and Altitude Correction Calculator
POST /travel/altimeter-cold-error$0.002Developer Utilities
Contingency fuel calculator
reserve fuel as % of trip fuel
POST /travel/contingency-fuel$0.002Developer Utilities
EV range at highway speed calculator
shorter range at higher use
POST /travel/ev-range-at-speed$0.002Developer Utilities
Horizontal sextant angle distance calculator
POST /travel/horizontal-sextant-distance$0.002Developer Utilities
Sailboat VMG from polar calculator
boat speed and true wind angle
POST /travel/sailboat-polar-vmg$0.002Developer Utilities
Time to waypoint at knots calculator
POST /travel/time-to-waypoint$0.002Developer Utilities
Boat metacentric height stability
GM, heel & righting moment
POST /travel/metacentric-stability$0.002Developer Utilities
Sea route great-circle distance calculator
NM and initial course
POST /travel/sea-great-circle$0.002Developer Utilities
Trip Average Spend per Day Calculator
Track Your Travel Budget
POST /travel/trip-spend-per-day$0.002Developer Utilities
Vacation fund per paycheck calculator
save for your trip by payday
POST /travel/vacation-fund-per-paycheck$0.002Developer Utilities
Allee effect threshold calculator
population growth with critical minimum
POST /bio/allee-threshold$0.002Developer Utilities
AT to GC Ratio Calculator for DNA Base Counts
POST /bio/at-gc-ratio$0.002Developer Utilities
Beer Lambert concentration calculator
absorbance to molarity
POST /bio/beer-lambert-concentration$0.002Developer Utilities
Bradford protein calculator
concentration from absorbance curve
POST /bio/bradford-protein$0.002Developer Utilities
Chilling hours calculator
hours below threshold for dormancy
POST /bio/chilling-hours$0.002Developer Utilities
Codon Usage Fraction Calculator for Gene Codon Counts
POST /bio/codon-usage-fraction$0.002Developer Utilities
Dilution for a countable plate calculator
target colony range
POST /bio/dilution-for-countable-plate$0.002Developer Utilities
Dilution to target OD calculator
culture and medium volumes
POST /bio/dilution-to-target-od$0.002